Merging the stealth and tactical advantages of sea and sky, the I-401 aircraft carrier submarine carried three specially designed Seiran attack bombers. The vessel had the potential to change the course of the war in the Pacific. Japanese SuperSub, investigates Japan s efforts to take submarine technology where it had never gone before, and reveals how close the Japanese came to using the sub for an attack on the U.S.

Merging the stealth and tactical advantages of sea and sky, the I-401 aircraft carrier submarine carried three specially designed Seiran attack bombers. The vessel had the potential to change the course of the war in the Pacific. Japanese SuperSub, investigates Japan's efforts to take submarine technology where it had never gone before, and reveals how close the Japanese came to using the sub for an attack on the U.S.